Boolean Field
type BoolDBField struct {
    *Field
    DefaultValue      bool
    DefaultFuncStruct *FuncStruct
}
func (i *BoolDBField) Default(v bool) *BoolDBField {
    i.DefaultValue = v
    i.HaveDefault = true
    return i
}
func (i *BoolDBField) DefaultFunc(v func() bool) *BoolDBField {
    i.DefaultFuncStruct.DefaultFunc(v)
    i.RequiredPackages = append(i.RequiredPackages, i.DefaultFuncStruct.PackageAddress)
    i.HaveDefault = true
    return i
}